SAMURAI Sound Intensity Software Options

Sound Intensity

SAMURAI Sound Intensity Software Options

SINUS Soundbook/Apollo Box or Lite or PCIe Cards + SAMURAI Software + SAMURAI Sound Intensity Options


Sound intensity probes may be connected to SINUS Messtechnik GmbH SOUNDbook/Apollo multi-channel data acquisition systems using SAMURAI software options or the SMT MATLAB Toolbox, or SINUS LABView Toolbox.

In addition to the basic SAMURAI software the Sound Intensity SAMURAI Option is necessary for sound intensity measurements and analysis.

Screenshots and descriptions of the software options are provided below:


Figure 1.
Sound pressure and intensity spectrum

Figure 2.
Sound pressure, intensity and power spectrum, P-I Index + Phase, Particle velocity, acoustical impedance and cross-spectrum

When investigating acoustic emission and propagation processes, the direction- and frequency-dependent energy flow of a sound field is of interest and is described by the sound intensity (energy per area and time, unit W/m2).

Sound intensity measurements are made e.g. for locating sound sources or to determine the sound power emitted from a surface. Determining the sound power by means of intensity measurements rather than by methods based only on sound pressure measurements brings advantages e.g. in the suppression of extraneous sound sources.

Furthermore, sound intensity measurements can be used in the field of building acoustics to determine the transmission loss R ‘.


Based upon the two microphone signals from a sound intensity probe, this option calculates the sound intensity at the position of the probe in the axial direction of the microphones. The frequency-dependent intensity thus calculated is displayed in third-octave bands or constant-width bands (the number of lines is selectable).

By rotating the probe, the direction of maximum intensity can be found. Furthermore, for stationary noise sources it is possible to use a scanning method to determine the sound power emitted from a defined surface.

The procedure implemented for determining the sound intensity is based upon analysis of the phase differences resulting e.g. from different paths between the sound source and the two microphones. For this reason, high demands are made upon the microphone pair in the probe. The software allows the measurement chain to be calibrated with regard to both pressure and phase.

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